This name is a synonym of Magnolia salicifolia (Siebold & Zucc.) Maxim..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117836) with original publication details: Natl. Hort. Mag. 33: 118 1954.
This name was in version 1 of The Plant List, record kew-117836, and has not been changed.